public async Task ThrowsExceptionForInvalidStatusCodeWithRepositoryId()
{
var responseTask = TestSetup.CreateApiResponse(HttpStatusCode.Conflict);
var connection = Substitute.For <IConnection>();
connection.Get <object>(Arg.Is <Uri>(u => u.ToString() == "repositories/1/assignees/cody"), null, null)
.Returns(responseTask);
var apiConnection = Substitute.For <IApiConnection>();
apiConnection.Connection.Returns(connection);
var client = new RepoCollaboratorsClient(apiConnection);
await Assert.ThrowsAsync <ApiException>(() => client.IsCollaborator(1, "cody"));
}